Dr. William Mazalewski, DO
What this data tells you about Dr. Mazalewski
Dr. William Mazalewski is an emergency medicine in Sarasota, FL, with 10 years in practice. Based on federal Medicare data, Dr. Mazalewski performed 2,184 Medicare services across 1,727 unique beneficiaries.
Between the years covered by Open Payments, Dr. Mazalewski received a total of $1,643 from 19 pharmaceutical and/or device companies across 68 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in emergency medicine. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Mazalewski is Very High — reflecting how much public federal data is available about this provider. This is not a quality rating. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
Medicare Practice Summary
Medicare Utilization ↗Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Hospital follow-up visit, high complexity | 603 | $94 | $211 |
| Office visit, established patient (30-39 min) | 316 | $95 | $214 |
| Critical care, first 30-74 min | 275 | $170 | $457 |
| Initial hospital admission, high complexity | 214 | $137 | $411 |
| Office visit, established patient (20-29 min) | 118 | $67 | $145 |
| New patient office visit (45-59 min) | 91 | $118 | $332 |
| Test to measure expiratory airflow and volume changes before and after medication administration | 87 | $28 | $120 |
| Office visit, established patient, complex (40-54 min) | 77 | $133 | $290 |
| Hemoglobin measurement | 73 | $5 | $14 |
| Test to examine how well the lungs exchange gases | 73 | $40 | $107 |
| Test for exercise-induced lung stress | 53 | $26 | $112 |
| New patient office visit, complex (60-74 min) | 47 | $161 | $417 |
| Test to determine lung volumes using sensors | 38 | $41 | $104 |
| Test to determine lung volumes using gas dilution or washout | 35 | $33 | $83 |
| Prolonged hospital inpatient or observation care evaluation and management service(s) beyond the total time for the primary service (when the primary service has been selected using time on the date of the primary service); each additional 15 minutes by th | 29 | $24 | $62 |
| Hospital follow-up visit, moderate complexity | 28 | $63 | $146 |
| Critical care, each additional 30 minutes | 16 | $86 | $229 |
| Initial hospital admission, moderate complexity | 11 | $103 | $278 |
Industry Payment Transparency
Open Payments through 2024 ↗Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
Payments by company (2024)
Associated products mentioned in payments ›
Most payments (93%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians. Total industry engagement is in the top 6% for emergency medicine in FL.
Geographic Context
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This measures how much public data is available about a provider — not how good they are. How we calculate this →
Summary
Dr. Mazalewski is a clinical cardiology specialist, with above-average Medicare volume (top 1% in FL), and high industry engagement (low-engagement, top 6%).
This summary is auto-generated from federal data. It describes data availability and patterns — not clinical quality. Read our methodology →
Frequently Asked Questions
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All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. The Transparency Score measures data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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